Charlize wants to measure the depth of an empty well. She droos a ball into the well and measures how long it takes the ball to hit the bottom of the well. The polynomial h= -16t^2 + 6 represents how far the ball has fallen after t seconds. How far has the ball fallen after one second?
Charlize's stopwatch measured a time of 3.2 seconds when the ball hit the bottom of the well. How deep in the well?

24/56=hx^7

step-by-step explanation:

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional